“Penentuan Status Mutu Kualitas Air Sungai Somber Hulu Menggunakan Metode Indeks Pencemaran”, sjt, vol. 10, no. 1, hlm. 54–62, Apr 2026, Diakses: Nov 02, 2026. Tersedia pada: https://journal.itk.ac.id/index.php/sjt/article/view/8481934